The is the highest court in the land and hears few and very specific cases.
a. appellate court
b. federal court
c. judicial court
d. supreme court

d. Supreme Court

Explanation:

The Supreme Court is the highest court in the judiciary system of the United States and hears few and very specific cases, namely, those that involve disputes over authority between local, states or the national government, inter-state conflicts, and controversies affecting Ambassadors, public Ministers, or Consuls. Furthermore, it is the court with authority to judicial review, that is to say, with the ability to review and declare the unconstitutionality of legislation passed by the legislative or of executive actions.  

the exclusive possession or control of the supply or trade in a commodity or service.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.